What is OpenAIS
OpenAIS is an open implementation of the Application Interface Specification (AIS) provided by the Service Availability Forum (SAForum or SA). SAForum defines a set of services for making highly available applications . AIS is the interface a program uses.
Where do I Find Documentation?
Haha, you made a funny. It's hard to find. Modern OpenAIS installations have man pages for the Concurrent Process Group (CPG) and Event (EVT) services, but that's about it. AIS is a soup of acronyms, so it's hard to keep up.
Ok, I found the AIS specification page.
Here are some other resources.
quick overview of the services.
A presentation in PDF format on the services provided.
A slide tutorial in PDF format. This "tutorial" is more about the style of the API than an actual programming reference.
If you find any others, please add them.